Hi, I am using filebeat 7.7.1 with kafka 0.10.0.0, and meet with the same problem.
This occurs when I use the kerberos configuration.
Filebeat is logging as below infinitely:
DEBUG [kafka] kafka/client.go:276 finished kafka batch
DEBUG [kafka] kafka/client.go:290 Kafka publish failed with: circuit breaker is open
INFO [publisher] pipeline/retry.go:196 retryer: send unwait-signal to consumer
INFO [publisher] pipeline/retry.go:198 done
INFO [publisher] pipeline/retry.go:173 retryer: send wait signal to consumer
INFO [publisher] pipeline/retry.go:175 done